Conversations are private messages that can be sent to other members. They are easily accessed by hovering over Conversations in the navigation menu. This will display a list of recent conversations as well as links to Show All recent conversations and Start a New Conversation. Starting a conversation can also done by clicking on a members Avatar or name, which will bring up an overlay with several options.

You can send conversations to up to 5 people at a time. As the conversation starter you also have options to allow others to invite other members or lock the conversation.

You have a few other options once you open an existing conversation. "Leave Conversation" is basically like deleting your copy of the message, it will also offer you the opportunity to ignore further conversations from the other member in the conversation.